Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gasair mixture), rendering it the property of the most explosive gas ?
(A) Hydrogen
(B) Acetylene
(C) Carbon monoxide
(D) Ammonia
Brown spots in fabrics will be caused by washing with water containing large amount of___________________?
(A) Iron
(B) Zinc
(C) Iodine
(D) Bromine
Inorganic impurities causing water pollution is ____________________?
(A) Fats
(B) Carbohydrates
(C) Salts of metals
(D) Protein
Ringelmann chart is used for the evaluation of _____________ pollution?
(A) Air
(B) Water
(C) Noise
(D) Radioactive
Which of the following is not a source of ozone emission in the atmosphere?
(A) Refrigerators
(B) Xerox machines
(C) Dermatological photo-therapy equipments
(D) High voltage electrical equipments
Photochemical smog is formed from automobile exhaust ________________?
(A) By reaction of hydrocarbon & nitric oxide in presence of sunlight
(B) Appears only on sunny days
(C) Is harmful for crops and trees also besides causing eye irritation & asthma
(D) All
Inhalation of silica dust by human being causes ___________________?
(A) Asphyxiation
(B) Shortness of breath
(C) Tuberculosis
(D) Both
The lowest layer of atmosphere is known as the_____________________?
(A) Stratosphere
(B) Troposphere
(C) Ionosphere
(D) None of these
The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant ?
(A) Chlorine
(B) Alkalis
(C) Benzene hexachloride
(D) Alkyl benzene sulphonate (ABS)
Carcinogenic air pollutants cause__________________?
(A) Bone decay
(B) Cancer
(C) Asphyxiation (suffocation)
(D) Anemia